*{
    margin: 0;
    padding: 0;
    background: yellow;
}
div{
    width: 100px;
    height: 100px;
    /*background: url(images/404.png) no-repeat;*/
    background: yellow;
    transform: rotate(45deg);
}
html,body{
    /*background: url(images/login.png) no-repeat;*/
    background: red;
}
.lll{
    background: royalblue;
}